linux-kernel - Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because the skew is too large:

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Message-ID: <alpine.DEB.2.11.1606301028300.3707@nanos>
Date:	Thu, 30 Jun 2016 10:40:47 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Borislav Petkov <bp@...en8.de>
cc:	Peter Zijlstra <peterz@...radead.org>, x86-ml <x86@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because
 the skew is too large:

On Wed, 29 Jun 2016, Borislav Petkov wrote:
> On Mon, Jun 27, 2016 at 10:06:31PM +0200, Borislav Petkov wrote:
> > Hey Thomas,
> > 
> > Just started seeing this now during testing of Rafael's s/r fix:
> > 
> > [   24.973955] clocksource: timekeeping watchdog on CPU3: Marking clocksource 'tsc' as unstable because the skew is too large:
> > [   24.987744] clocksource:                       'acpi_pm' wd_now: 2df835 wd_last: a6bb64 mask: ffffff
> > [   24.999587] clocksource:                       'tsc' cs_now: 2bbe793d1e cs_last: 296e28763c mask: ffffffffffffffff
> > [   25.013400] clocksource: Switched to clocksource acpi_pm
> > 
> > In the previous boot it was CPU1.
> 
> And here it is again:
> 
> ...
> [   15.720833] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
> [   32.883077] clocksource: timekeeping watchdog on CPU1: Marking clocksource 'tsc' as unstable because the skew is too large:
> [   32.896986] clocksource:                       'acpi_pm' wd_now: 8e147 wd_last: 531b43 mask: ffffff
> [   32.908834] clocksource:                       'tsc' cs_now: 385f4b6d1e cs_last: 354328bcea mask: ffffffffffffffff
> [   32.922293] clocksource: Switched to clocksource acpi_pm

What's the tsc freqeuency on your machine?